Wiring Main Circuits - IACDRIVE I5000 Series Operation Manual

4.5 Wiring Main Circuits

4.5.1 Wiring at input side of main circuit
4.5.1.1 Circuit breaker
It is necessary to connect a circuit breaker which is compatible with the capacity of
inverter between 3ph AC power supply and power input terminals (R, S, T). The capacity
of breaker is 1.5~2 times to the rated current of inverter. For details, see <Specifications
of Breaker, Cable, and Contactor>.
4.5.1.2 Contactor
In order to cut off the input power effectively when something is wrong in the system,
contactor should be installed at the input side to control the on/off of the main circuit
power supply.
4.5.1.3 AC reactor
In order to prevent the rectifier damage resulted from the large current, AC reactor should
be installed at the input side. It can also prevent rectifier from sudden variation of power
voltage or harmonic generated by phase-control load.
4.5.1.4 Input EMC filter
The surrounding device may be disturbed by the cables when the inverter is working. EMC
filter can minimize the interference. Just like the following figure.
4.5.2 Wiring at inverter side of main circuit
4.5.2.1 DC reactor
Inverter from 18.5kW to 90kW have built-in DC reactor which can improve the power factor.
4.5.2.2 Braking unit and braking resistor
• Inverter of 15KW and below have built-in braking unit. In order to dissipate the
regenerative energy generated by dynamic braking, the braking resistor should be
Figure 4.13 Wiring at input side of main circuit.
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